CN208015351U - A kind of short circuit of electric wiring and earth leakage protective device - Google Patents

Abstract

It includes leakage circuit breakers QF, capacitance C1, capacitance C2, discharge coil L and electromagnetic switch K that the utility model, which provides a kind of short circuit of electric wiring and earth leakage protective device, circuit,.The electric wiring short circuit of the utility model and earth leakage protective device can be applicable in the line of alternating current 220V, are used as line short and to ground wire earth leakage protective.The circuit design of the utility model is reasonable, and reliability is high, and the element used is simple, and stability is good, high sensitivity.The utility model is applied in electric wiring, when short circuit or electric leakage occur for rear class electric wiring, the major accident caused by rear class electric wiring short circuit and due to electric leakage will be effectively prevented in the leakage circuit breakers tripping of internal trigger in 0.1 second inside it, to rapid disconnecting circuit.

Description

A kind of short circuit of electric wiring and earth leakage protective device

Technical field

The utility model is related to a kind of electric protective device, specifically a kind of electric wiring short circuit and earth leakage protective device, Belong to low voltage electrical apparatus technology field.

Background technology

As the improvement of people's living standards, the electric appliance that family uses is more and more, electric power is also increasing, and very The load that the mostly old original electric wiring of building can carry is smaller, the phenomenon that being susceptible to circuit overload, fever and aging, into And lead to short circuit or the generation of electric leakage accident.Short circuit refer to the firewire in supply line and between zero curve it is direct without electrical appliance Connection, circuit occur short circuit when, circuital current can be caused excessive and damage electric appliance, and short circuit circuit also will produce it is prodigious Electric arc is easy to cause fire, causes immeasurable heavy losses.And when the insulating materials between firewire and electric appliance casing is because serious It when aging, breakage cause directly to be connected to, will leak electricity, this electric leakage is abnormally dangerous, it is likely that jeopardizes the life of electric shock person.

It is used for short-circuit protection and earth leakage protective product, mainly breaker, earth leakage protective device or the two on the market at present The leakage circuit breakers that function is combined into one, but these products are in use, is susceptible to that movement speed is excessively slow or action is lost The phenomenon of spirit, failure do not have due protective effect when occurring.When short circuit occurs for circuit, since short circuit current is very big, such as Fruit disconnection action of tripping is too slow, still can there is a phenomenon where electric appliances to burn, or even fire can be caused.In addition leakage circuit breakers will advise Model uses, it is necessary to install independent ground wire, this is difficult to accomplish for the user in rural area, and rural subscribers often only have firewire It registers one's residence with zero curve, if firewire leaks electricity to electric appliance casing, no ground wire can cause leakage current that can not discharge, and earth leakage protective device is not It can act, when contacting electric appliance casing electric shock accidents will occur for people.

Utility model content

To solve the above-mentioned problems, the utility model provides a kind of short circuit of electric wiring and earth leakage protective device, by it Apply in electric wiring, when rear class electric wiring occur short circuit or electric leakage when, can within 0.1 second rapid disconnecting circuit, It is very easy to use and without installing independent ground wire.

Technical solution used by the utility model is as follows：

A kind of short circuit of electric wiring and earth leakage protective device, circuit include leakage circuit breakers QF, capacitance C1, capacitance C2, Discharge coil L and electromagnetic switch K, wherein leakage circuit breakers QF use two level TW two wire leakage circuit breakers, leakage circuit breakers QF Two ends of incoming cables be connected respectively with zero curve N with the firewire L of electric wiring, the firewire leading-out terminal and capacitance of leakage circuit breakers QF One end of C1, one end of discharge coil L, one end of coil of electromagnetic switch K, electromagnetic switch K normally opened contact K1 one The common connection in end, the other end of the other end of the other end connection discharge coil L of capacitance C1 and the coil of electromagnetic switch K, leakage The zero curve end of incoming cables of electrical circuit breakers QF is also connected with one end of capacitance C2, and the other end connection electromagnetic switch K's of capacitance C2 is normally opened The other end of contact K1；The other end of capacitance C1 is drawn outward is used as firewire L1 leading-out terminals, the zero curve outlet of leakage circuit breakers QF End is drawn outward is used as zero curve N1 leading-out terminals, and the other end of capacitance C2 is drawn outward is used as ground wire leading-out terminal, by firewire L1 outlets End, zero curve N1 leading-out terminals and ground wire leading-out terminal composition single-phase three wire system circuit are powered to the successive load of electric wiring.

The operation principle of the utility model is：After the present apparatus is accessed in electric wiring, when following stage circuit is normal, by Alternating current is connected in capacitance C1, the both ends capacitance C1 do not have voltage difference, therefore do not influence to power to rear class；When the fire of late-class circuit When with zero curve short circuit occurs for line, firewire L1 leading-out terminal instantaneous variations are zero potential, thus generate an electricity at the both ends of capacitance C1 Pressure difference makes the coil of electromagnetic switch K obtain electric, and the normally opened contact K1 of electromagnetic switch K is closed, and the electric current of firewire is flowed through capacitance C2 To the zero curve end of incoming cables of leakage circuit breakers QF, keep two line currents of leakage circuit breakers QF uneven, and then trigger earth leakage protective mechanism Action, leakage circuit breakers QF immediate trips power-off, thus protects rear class electric wiring；When the firewire of late-class circuit is to electric appliance casing When electric leakage, leakage current can flow to the zero curve end of incoming cables of leakage circuit breakers QF through ground wire and capacitance C2, make two lines of leakage circuit breakers QF Current imbalance, and then earth leakage protective mechanism action is triggered, thus the power-off of leakage circuit breakers QF immediate trips protects rear class electrical Circuit.

The electric wiring short circuit of the utility model and earth leakage protective device can be applicable in the line of alternating current 220V, make It is used for line short and to ground wire earth leakage protective.The circuit design of the utility model is reasonable, and reliability is high, the element letter used Single, stability is good, high sensitivity.The utility model is applied in electric wiring, when short circuit or leakage occur for rear class electric wiring When electric, all can in the leakage circuit breakers tripping of internal trigger in 0.1 second inside it, to rapid disconnecting circuit, effectively prevent because The short circuit of rear class electric wiring and electric leakage and caused by major accident.

Description of the drawings

Fig. 1 is the circuit diagram of the short circuit of this electric wiring and earth leakage protective device.

Fig. 2 be Fig. 1 in capacitance C1 using two concatenated capacitance C11, C12 substituted after circuit diagram.

Fig. 3 be Fig. 1 in capacitance C1 using two capacitance C13, C14 in parallel substituted after circuit diagram.

Specific implementation mode

The utility model is described further below in conjunction with the accompanying drawings.

As shown in Figure 1, this electric wiring short circuit and earth leakage protective device circuit include leakage circuit breakers QF, capacitance C1, Capacitance C2, discharge coil L and electromagnetic switch K, wherein leakage circuit breakers QF use two level TW two wire leakage circuit breakers, electric leakage disconnected Two ends of incoming cables of road device QF are connected with the firewire L of electric wiring with zero curve N respectively, the firewire leading-out terminal of leakage circuit breakers QF With one end of capacitance C1, one end of discharge coil L, one end of coil of electromagnetic switch K, electromagnetic switch K normally opened contact One end of K1 connects jointly, the other end of the other end of capacitance C1 connection discharge coil L and the coil of electromagnetic switch K it is another End, the zero curve end of incoming cables of leakage circuit breakers QF are also connected with one end of capacitance C2, the other end connection electromagnetic switch K's of capacitance C2 The other end of normally opened contact K1；The other end of capacitance C1 is drawn outward is used as firewire L1 leading-out terminals, the zero curve of leakage circuit breakers QF Leading-out terminal is drawn outward is used as zero curve N1 leading-out terminals, and the other end of capacitance C2 is drawn outward is used as ground wire leading-out terminal, by firewire L1 Leading-out terminal, zero curve N1 leading-out terminals and ground wire leading-out terminal composition single-phase three wire system circuit are supplied to the successive load of electric wiring Electricity.

The capacitance C1 is more than 300V using ac voltage withstanding value, and capacity is more than the polarity free capacitor of 50 μ F；Capacitance C2 is used Ac voltage withstanding value is more than 300v, and capacity is less than the polarity free capacitor of 50 μ F；Two concatenated capacitances may be used in the capacitance C1 C11, C12 are substituted, to reduce the pressure voltage for selecting capacitance, as shown in Figure 2；The capacitance C1 can also use two parallel connections Capacitance C13, C14 substituted, with reduce select capacitance capacity, as shown in Figure 3.

The discharge coil L may be used reactor and be substituted.It is disconnected in leakage circuit breakers QF in the circuit of the present apparatus The both ends of the moment of electricity, capacitance C1 carry certain electricity, and discharge coil L or reactor can quickly bleed off the electricity of capacitance C1 Amount.

The electromagnetic relay of the models such as JTX-2C can be used in the electromagnetic switch K.

Above-mentioned legend is only the exemplary embodiments of the utility model, is not intended to limit the utility model, all in this practicality Any modification or equivalent replacement and improvement etc., should be included in the guarantor of the utility model made by within novel spirit and principle Within the scope of shield.

Claims (5)

1. a kind of electric wiring short circuit and earth leakage protective device, it is characterized in that：The circuit of described device include leakage circuit breakers QF, Capacitance C1, capacitance C2, discharge coil L and electromagnetic switch K, wherein leakage circuit breakers QF use two level TW two wire leakage, breaking Two ends of incoming cables of device, leakage circuit breakers QF are connected with the firewire L of electric wiring with zero curve N respectively, leakage circuit breakers QF's Firewire leading-out terminal and one end of capacitance C1, one end of discharge coil L, one end of coil of electromagnetic switch K, electromagnetic switch K One end of normally opened contact K1 connect jointly, the other end of the other end connection discharge coil L of capacitance C1 and electromagnetic switch K's The other end of coil, the zero curve end of incoming cables of leakage circuit breakers QF are also connected with one end of capacitance C2, the other end connection electricity of capacitance C2 The other end of the normally opened contact K1 of magnetic-type switch K；The other end of capacitance C1 is drawn outward is used as firewire L1 leading-out terminals, leakage, breaking The zero curve leading-out terminal of device QF is drawn outward is used as zero curve N1 leading-out terminals, and the other end of capacitance C2 is drawn outward is used as ground wire outlet End, rear class of the single-phase three wire system circuit to electric wiring is formed from firewire L1 leading-out terminals, zero curve N1 leading-out terminals and ground wire leading-out terminal Load is powered.

2. electric wiring short circuit according to claim 1 and earth leakage protective device, it is characterized in that：The capacitance C1 is using friendship It flows pressure voltage and is more than 300V, capacity is more than the polarity free capacitor of 50 μ F；Capacitance C2 is more than 300v using ac voltage withstanding value, and capacity is small In the polarity free capacitor of 50 μ F.

3. electric wiring short circuit according to claim 1 and earth leakage protective device, it is characterized in that：The capacitance C1 uses two A concatenated capacitance C11, C12 are substituted.

4. electric wiring short circuit according to claim 1 and earth leakage protective device, it is characterized in that：The capacitance C1 uses two Capacitance C13, C14 of a parallel connection are substituted.

5. according to the short circuit of claim 1-4 any one of them electric wiring and earth leakage protective device, it is characterized in that：The electric discharge Coil L is substituted using reactor.